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SECOR w ..secoccom <br /> INTERNATIONAL 57 Lafayette Circle,2n°Floor <br /> S E C O R INCORPORATED Lafayette,CA 9454549 <br /> 925-299-9300 <br /> 925-299-93�j022 /JF. <br /> tJanuary 22, 2003 DDDD� v ED <br /> Mr.' James Barton JAN 2 7 2003 <br /> CaliforniaENVIRONMENT HEALTH <br /> CalRegional Water quality Control Board' PERMIT/SERVICES Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> Re: FOURTH QUARTER 2002 GROUNDWATER MONITORING REPORT <br /> TOWER PARK MARINA, 14900 WEST HIGHWAY 12, LODI, CALIFORNIA <br /> ' SECOR Project No. 050T.02926.00.0004 <br /> Dear Mr. Barton: <br /> ' On behalf of Tower Park Marina Investors LP and Westrec Marinas Management, Inc., SECOR <br /> International Incorporated (SECOR) is submitting this Fourth Quarter 2002 Groundwater Monitoring <br /> Report for Tower Park Marina (the Marina) located at 14900 West Highway 12 in Terminous (near <br /> ' Lodi), California (the Site; see Figure 1, Site Location Map). We are providing this document to the <br /> California Regional Water Quality Control Board, Central Valley Region (RWQCB) in accordance <br /> with the RWQCB's Monitoring and Reporting Program (MRP) No. R5-2002-0824 dated July 18, <br /> 2002, <br /> BACKGROUND AND PREVIOUS WORK <br /> ' The Site is an operating marina located on a levee along Potato Slough and operates aboveground <br /> storage tanks (ASTs), a roadside fuel dispenser for fueling automobiles/trailered boats, and dockside <br /> fuel dispensing facilities for fueling boats (Figure 2). <br /> tInitial Investigation <br /> Petroleum hydrocarbon-impacted soil was observed during AST and underground conveyance line <br /> ' replacement activities on the levee in September 1991. Pressure testing prior to line replacement <br /> activities indicated the potential presence of leaks from the roadside gasoline dispenser, unleaded <br /> and regular gasoline pipes leading from the roadside dispenser to the manifold near the shop office, <br /> the premix line from the AST area to the manifold, and the diesel piping leading from the manifold to <br /> ' the docks. The diesel pipe leading from the manifold to the dock area was excavated and a <br /> damaged coupling was found just outside of the shop office; the coupling was replaced. No visible <br /> signs of leaks, surface stains, or sheen on the water in the slough were found. <br /> ' Subsurface investigative activities were first conducted at the Site in November 1991; soil samples <br /> submitted for laboratory analysis confirmed the presence of petroleum hydrocarbon-impacted soil <br /> beneath the conveyance fines. The highest levels of petroleum hydrocarbons were found in the soil <br /> ' sample collected near the roadside dispenser; this sample contained 150 milligrams per kilogram <br /> (mg/kg) of total petroleum hydrocarbons as gasoline (TPHg), 30 mg/kg of total petroleum <br /> hydrocarbons as diesel (TPHd), and 25.67 mg/kg of benzene, toluene, ethyl benzene, and xylenes <br /> ' (BTEX). <br /> I Tower Park\QMR\2002 QMR\04_2002\4th QTR 2002.doc SECOR International Incorporated <br /> ' SECOR Project No.050T.02926.00.0004 1/22/2003 4:30 PM <br />